<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cartInfo in cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <!-- 给购物车单个商品的多选框一个change事件，传入发送请求需要的id和选中状态，如果当前状态是1则要传的是0 -->
            <input type="checkbox" name="chk_list" :checked="cartInfo.isChecked===1" @change="changeSingleChecked(cartInfo.skuId,cartInfo.isChecked===1?0:1)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{cartInfo.skuName}}</div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="updataInfoNum(cartInfo.skuId,-1)">-</a>
            <input autocomplete="off" type="text" :value="cartInfo.skuNum" minnum="1" class="itxt" @change="updataInfoNum(cartInfo.skuId,$event.target.value-cartInfo.skuNum)">
            <a href="javascript:void(0)" class="plus" @click="updataInfoNum(cartInfo.skuId,1)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cartInfo.skuNum*cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteSingle(cartInfo.skuId)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="isAllChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllGoods">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{goodsAllnum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{goodsAllPrice}}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="$router.push('/trade')">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import {requestCartList,requestAddCar,requestUpdateSingleCheck,requestUpdateAllCheck,requestDeleteSingleGood,requestDeleteAllGoods} from "@/api"
  export default {
    name: 'ShopCart',
    data(){
      return{
          shopCartList:[]
      }
    },
    mounted(){
      this.getShopCartList()
    },
    computed:{
        //购物车列表的数据
        cartInfoList(){
        //因为shopCartList有可能没数据，所以需要使用可选链
            return this.shopCartList[0]?.cartInfoList||[]
        },
        //获取已选中商品的总数量
        goodsAllnum(){
            return this.cartInfoList.reduce((p,c)=>{
                return  p + (c.isChecked===1 ? c.skuNum : 0)
            },0)
        },
        //获取已选中商品的总价格
        goodsAllPrice(){
             return this.cartInfoList.reduce((p,c)=>{
                return p + (c.isChecked===1?c.skuNum*c.skuPrice:0)
             },0)
        },
        //全选按钮是否要被选中，使用every遍历列表，当列表的checked都为1，就返回true
        //因为全选按钮是可读可写的，所以要使用get、set
        isAllChecked:{
            get(){
             return this.cartInfoList.every((item)=>{
                  return item.isChecked === 1
              })
            },
            //修改全选按钮的状态，重新发送请求
           async set(isChecked){
                //修改全选按钮的请求还需要接收购物车所有商品的id组成的数组
                const skuIdList = this.cartInfoList.reduce((p,c)=>{
                         p.push(c.skuId)
                         return p
                },[])
                await requestUpdateAllCheck(isChecked?1:0,skuIdList)
                 //重新发送购物车列表的请求
                this.getShopCartList()
            }
           
        },
            
    },
    methods:{
        async getShopCartList(){
          const result = await requestCartList()
          this.shopCartList = result
        },
        //点击加减和在输入框中输入商品数量，发送加入购物车请求，对购物车中商品的数量进行修改
        //给表单元素都是绑定change事件，当内容变化时，发送e.target.value-当前的商品数量
       async updataInfoNum(skuId, skuNum){
          await  requestAddCar({skuId, skuNum})
          //重新发送购物车列表的请求
          this.getShopCartList()
        },
        //改变单个商品选中状态
        async  changeSingleChecked(skuId,isChecked){
            await requestUpdateSingleCheck({skuId,isChecked})
            //重新发送购物车列表的请求
           this.getShopCartList()
        },
        //删除单个商品
        async deleteSingle(skuId){
            await requestDeleteSingleGood(skuId)
            //重新发送购物车列表的请求
           this.getShopCartList()
        },
        //删除全部商品
        async deleteAllGoods(){
            const skuIdList = this.cartInfoList.reduce((p,c)=>{
                    // p.push(c.isChecked===1?c.skuId:'')
                    c.isChecked === 1 ? p.push(c.skuId): p
                    return p
            },[])
            await requestDeleteAllGoods(skuIdList)
            //重新发送购物车列表的请求
           this.getShopCartList()
        }
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 4.1667%;
          }

          .cart-list-con2 {
            width: 25%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

          .cart-list-con3 {
            width: 20.8333%;

            .item-txt {
              text-align: center;
            }
          }

          .cart-list-con4 {
            width: 12.5%;

          }

          .cart-list-con5 {
            width: 12.5%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 12.5%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 12.5%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>